linux-ext4 - Re: ext4-lazy (SMR-optimizations) landing to kernel?

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Message-ID: <c2d584af-c91b-bcbb-ac13-d1e9e6162a4b@redhat.com>
Date:   Mon, 17 Apr 2017 09:18:11 -0500
From:   Eric Sandeen <esandeen@...hat.com>
To:     Andreas Dilger <adilger@...ger.ca>, Ts'o Theodore <tytso@....edu>
Cc:     linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: ext4-lazy (SMR-optimizations) landing to kernel?

On 4/10/17 10:06 PM, Andreas Dilger wrote:
> Hi Ted,
> now that FAST'17 is behind us, is there any plan to land the ext4-lazy code
> (SMR optimizations) to the upstream kernel?  This looks like it improves
> some workloads even without SMR disks, and doesn't have any noticeable
> overhead for other workloads.
> 
> I'd guess the one thing that we might want to do is still allow the journal
> to optionally checkpoint the metadata to the filesystem in the background,
> when the filesystem is otherwise idle, so that in case of journal loss for
> some reason the whole filesystem is not lost?

IIRC even the new larger default journal size was a big win by itself, yes?

-Eric

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